定向长钻孔在黄陵二矿区域瓦斯预抽的试验研究_朱兴攀.pdfVIP

1,2 1,2 1,2 1,2 1,2 1. 710065 2. 710065 409 3/t42.52%48.17% 1.561.73m 0.65MPa0.190.28MPa351.46 264600 Experimental Study on area Gas Pre-drainage via Directional Long Dorehole Drilling in Huangling No.2 Mine Zhu Xingpan1,2,Wang Linhua1,2,Xu Wenquan1,2,Si Junhong1,2,Wang Xiaojun1,2 1.Shaanxi Coal and Chemical Technology Institute Co., Ltd. Shaanxi, Xi’an, 710065, China; 2.Engineering Research Center of Green Ming, Shanxi Xi an 710065, China Abstract: To solve the problem that drilling in coal seam for gas drainage in Huangling mining No.2 Mine is easy to drill the roof and the floor of coal seam through, and cause drainage in blank zone and repeated cross, as well as small drainage area and short drainage time, this makes the gas control in advance impossible. Based on that, the gas drainage trial by directional long boreholes was carried out in medium-thick coal seam at No.409 working face in No.2 Mine. Through long drilling design and construction technology improvement, effectively improve the efficiency of construction. Two years after drainage, coal seam gas content is reduced to 3 1.56~1.73m /t, drainage rate reached 42.52%~48.17%. The gas pressure of Coal seam reduced from 0.65 MPa to 0.19~0.28MPa.Time limit for the project was shorten 35 days, the initial flow of drilling gas was increased 1.46 times and total cost was saved 264600 yuan. Thus, effectively eliminated the coal extraction blind area and eliminated the gas overrun occur in the process of mining.